I pondered uncomfortably on these rather contradictory statements. Clearly Mr. Weiss did not mean to entertain the theory of opium poisoning; which was natural enough if he had no knowledge of the drug having been used. But still⁠—

“I suppose,” said Mr. Weiss, “you have experience of sleeping sickness?”

The suggestion startled me. I had not. Very few people had. At that time practically nothing was known about the disease. It was a mere pathological curiosity, almost unheard of excepting by a few practitioners in remote parts of Africa, and hardly referred to in the textbooks. Its connection with the trypanosome-bearing insects was as yet unsuspected, and, to me, its symptoms were absolutely unknown.

“No, I have not,” I replied. “The disease is nothing more than a name to me. But why do you ask? Has Mr. Graves been abroad?”